Waterproof layer specifictions:
The waterproof is necessary for your roof,the asphalt is the common way to againest water as you can see in above photo.
The usual roof structure:
1,basic structural layer + waterproof layer + board for nailling+ our thatch tiles(standard way)
2,cement+waterproof layer + board for nailling+ our thatch tiles
3,basic structural
board + waterproof layer + our thatch tiles
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